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extension.onRequestExternal

files/en-us/mozilla/add-ons/webextensions/api/extension/onrequestexternal/index.md

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[!WARNING] This is not implemented in Firefox because it has been deprecated since Chrome 33. Please use runtime.onMessageExternal instead.

Fired when a request is sent from another extension.

Syntax

js-nolint
chrome.extension.onRequestExternal.addListener(function(
  request,      // optional any
  sender,       // runtime.MessageSender
  sendResponse, // function
) { })
chrome.extension.onRequestExternal.removeListener(listener)
chrome.extension.onRequestExternal.hasListener(listener)

Events have three functions:

  • addListener(listener)
    • : Adds a listener to this event.
  • removeListener(listener)
    • : Stop listening to this event. The listener argument is the listener to remove.
  • hasListener(listener)
    • : Check whether listener is registered for this event. Returns true if it is listening, false otherwise.

addListener syntax

Parameters

  • listener
    • : The function called when this event occurs. The function is passed these arguments:
      • request
        • : any. The request sent by the calling script.
      • sender
        • : {{WebExtAPIRef('runtime.MessageSender')}}.
      • sendResponse
        • : function. Function to call when you have a response. The argument should be any JSON-ifiable object, or undefined if there is no response.

{{WebExtExamples}}

Browser compatibility

{{Compat}}

[!NOTE] This API is based on Chromium's chrome.extension API. This documentation is derived from extension.json in the Chromium code.

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